1914] Pemphigine Attacking Populus In Colorado. 69 
EXPLANATION OF PLATE XV. 
(G3PACinre TE) 
Plate XV. Figures 1 to 9, Thecabius populiconduplifolius Cowen: 1, stem mother 
gall on margin of leaf; 2, young adult stem mother; 3, showing wax plates on head 
and thorax of stem mother; 4, antenna of stem mother; 5, cottonwood twig showing 
the folded terminal leaves where the young from the stem mother gall have set- 
tled at b, and a stem mother gall at a; 7, antenna of fundatrigenia, or second gen- 
eration lice; 8 antenna of alate sexupara or pre-sexual form; 9 antenna of apterous 
form found on Ranunculus during the summer and fall. 
Figures 10 to 14, Astphum sacculi, n. sp.; 10, pocket-like gall from Aspen; 
11, fundatrix or stem mother; 12, pupa; 18, antenna of the fundatrix; 14, antenna 
of the fundatrigenia. 
Figures 15 to 20, Mordwilkoja vagabundus Walsh: 15, fundatrix; 16, antenna of 
fundatrix; 17 antenna of fundatrigenia; 18, the vagabond gall containing fundatrix 
and young; 18, a, brown scale beneath which there is an opening into the interior 
of the gall; 19, a section of the gall showing oscula (0) that open for the escape 
of the mature lice; 20 (b) the closed mouth, also shown at 18, a. 
Drawings by Miss Caroline M. Preston, except Figures 1 and 2, which are by 
Miss M. A. Palmer. Original. 
